(1)4X+10Y=3.615X-10Y=8(2)5X+2Y=253X+4Y=15(3)2X+3Y=63X-2Y=2
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(1)
4X+10Y=3.6
15X-10Y=8
(2)
5X+2Y=25
3X+4Y=15
(3)
2X+3Y=6
3X-2Y=2
4X+10Y=3.6
15X-10Y=8
(2)
5X+2Y=25
3X+4Y=15
(3)
2X+3Y=6
3X-2Y=2
4X+10Y=3.6 (1)
15X-10Y=8 (2)
(1)+(2)得
19X=58/5
X=58/95
代入到(2)得
15*58/95-10Y=8
Y=11/95
2、解
5X+2Y=25 (1)
3X+4Y=15 (2)
(1)*2-(2)
7X=35
X=5
代入(1)得
2Y=0
Y=0
3、解
2X+3Y=6 (1)
3X-2Y=2 (2)
(1)*3-(2)*2得
13Y=18-4
Y=14/13
代入(1)得
2X+42/13=6
X=18/13
15X-10Y=8 (2)
(1)+(2)得
19X=58/5
X=58/95
代入到(2)得
15*58/95-10Y=8
Y=11/95
2、解
5X+2Y=25 (1)
3X+4Y=15 (2)
(1)*2-(2)
7X=35
X=5
代入(1)得
2Y=0
Y=0
3、解
2X+3Y=6 (1)
3X-2Y=2 (2)
(1)*3-(2)*2得
13Y=18-4
Y=14/13
代入(1)得
2X+42/13=6
X=18/13
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